John Gyn wrote a letter to John Paston in 1436/7
https://www.gutenberg.org/files/40989/40989-h/40989-h.htm

425. From John Gyn to Willliam Paston I, about 1436
438. From John Gyn to Willliam Paston I, probably before 1440
https://books.google.ca/books?id=_rGa6E32uiwC&pg=PR40&lpg=PR40&dq=John+%22Gyn%22+letter+to+Paston+-Gwynne+-Gwynn+-Gwyn&source=bl&ots=rM64YG1drg&sig=ACfU3U1MNNiS-0rG4XyYRZLG6sySZ1vI_w&hl=en&sa=X&ved=2ahUKEwjU_ev6243yAhXYXM0KHSXVAJcQ6AEwEHoECBQQAw#v=onepage&q=Gyn&f=false

[This John Gyn is probably the chaplain of Norwich - see: John_Gyn_1430_Norwich.txt]

[It appears that William Paston also had an estate at Therfield, in Hertfordshire]

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JOHN GYN TO JOHN PASTON

1435–6

To the worthy and worshipful sir and my good maister, John Paston of Trynyte hall in Cambrigge

Right worthy and worshipfull sir, and my good maister, I comaund me to yow. Like it yow to witte that on the Soneday next after the Ascencion of oure Lord, in the high weye betwex Cambrigge and the Bekyntre toward Newmarket, I fonde a purs with money ther inne. Th’entent of this my symple lettre is this, that it please to your good Maistership by weye of charite, and of your gentilnesse, to witte if ony of youre knowleche or ony other, swich as yow semeth best in your discrecion, have lost swich a purs, and, the toknes ther of told, he shal have it ageyn, what that ever he be, by the grace of oure Lord, Who ever have yow in his blissed kepyng. Wretyn at Sneylewell the Moneday next after the seid Soneday. By youre pover servaunt, John Gyn.

https://blogs.bl.uk/digitisedmanuscripts/2015/04/the-paston-letters-go-live.html

same text at: https://fiftywordsforsnow.com/ebooks/paston/paston2.html

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Twenty Years of the Journal of Historical Sociology: Essays on the British State Volume 1 Edited by Yoke-Sum Wong and Derek Sayer © 2008 Blackwell Publishing Ltd. ISBN: 978-1-405-17933-1

"John Gyn, a Paston employee at Snailwell in Cambridgeshire writes to John Paston, an undergraduate at Trinity Hall, Cambridge (Davis II: 21):

[Letter, as above]

https://epdf.pub/twenty-years-of-the-journal-of-historical-sociology-volume-1-essays-on-the-briti.html